2. Limit Exposure to the Sun
Avoid sun-baking. In this day and age, with global warming and ozone depletion, it really is not a good idea, and should not be encouraged or indulged in. The same goes for tanning by artificial means such as solariums.
Limiting exposure to sunlight especially during its strongest hours between 10 am to 4 pm also helps. If you do need to be outdoors seek shade, such as under a large tree, umbrella, and so on.